﻿using System;

namespace CircleCalculator
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Circle Calculator");

            Console.Write("R = ");
            double R = double.Parse(Console.ReadLine());
            double C = 2 * Math.PI * R;
            double A = Math.PI * R * R;

            Console.WriteLine("C = " + C);
            Console.WriteLine("A = " + A);

            Console.ReadKey();
        }
    }
}
